Insulating bushing



FIG. 1 is a perspective plan view of an insulating bushing embodying the present design;

FIG. 2 is a perspective bottom view thereof;

FIG. 3 is a front view thereof, the rear view being identical with the front view;

FIG. 4 is a left side view thereof, the right side view being identical with the left side view;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a typical referential view thereof when it is used.

The broken line showing of the plate and conductors is included for the purpose of illustrating environmental structure only and forms no part of the claimed design. 

The ornamental design for an insulating bushing, as shown and described. 